One common plotline could be the characters facing high school challenges while also dealing with their demigod powers. For example, a character might struggle to balance a tough exam with a sudden monster attack. Another could be romantic relationships forming in the high school setting, like Percy and Annabeth having a high school date while also being on guard for any mythological threats. And sometimes, there are plotlines where new demigods are discovered in the high school, causing a stir among the existing ones.
First, know the characters well from both 'How to Train Your Dragon' (HTTYD) and 'Heroes of Olympus' (HOO). For example, Toothless from HTTYD has unique behaviors and abilities, and Percy Jackson from HOO has his own set of powers and personality traits. Then, create an interesting plot that combines the two universes. It could be something like the demigods from HOO visiting the world of HTTYD and having to work together with the dragon riders to fight a common enemy. Also, make sure to keep the voices of the characters true to their original stories.
I'm not entirely sure what 'hoo sex fanfic' specifically refers to. It could potentially be some form of fan - created fictional writing related to a particular 'hoo' concept that involves sexual themes. However, without more context, it's difficult to be precise.
You can start by looking on fanfiction.net. It has a large collection of various fanfictions, including 'hoo hp crossover' ones. Just use the search bar and type in relevant keywords to find what you're looking for.
There's a fanfic called 'Percy Jackson in the Wizarding World'. In this story, Percy finds himself accidentally transported to Hogwarts. His skills as a demigod are put to the test in the magical school, and he has to navigate the complex relationships and rules there. It's full of action and humor.
One popular trope is the 'fish out of water' situation. For example, a character from HTTYD finding themselves in the world of HOO and being completely confused by the Greek gods and demigods. Another is the 'team - up' trope, where the dragon riders and the demigods join forces to defeat a powerful enemy. A third one could be the 'culture clash' trope, with the Vikings from HTTYD having different values and ways of life compared to the modern - day (sort of) world of HOO.
Percy Jackson is always an interesting character. His laid - back yet heroic nature can lead to some great high school scenarios. He might be the cool kid who's also secretly a powerful demigod. Annabeth is also a great choice. Her intelligence and determination can make for some intense high school drama, like competing in academic contests while also dealing with the threat of monsters. And Leo, with his humor and mechanical skills, can create some really fun and unique situations in a high school setting, like building crazy gadgets for a school project.
I highly doubt 'hoo sex fanfic' is a popular genre. Since the term is so unclear and not something that is commonly talked about in mainstream literature or fan - fiction communities.
Since I don't have more information on 'hoo graphic novel', it could potentially be a story set in a fictional world. Maybe it's about a group of heroes or anti - heroes, and the graphic novel format would allow for vivid illustrations of the settings, characters, and their actions. It could also be a more personal, slice - of - life story presented in a graphic form.
In 'The Last Olympian' fanfiction, the hoo characters are often involved in themes related to family. They might have complex family relationships that they need to navigate. For example, they could be trying to live up to the expectations of their families or dealing with family secrets. Another theme is the power of hope. Even in the darkest of situations, the hoo characters hold on to hope, which can be a driving force in the story and is something that ties the characters together.